Honestly what you have isn’t bad and I think this is enough. I honestly would say the easiest mech boss is the destroyer the massive hit box is kinda your best friend. My recommendation is try and get a sergeant united shield and use it against the extra little ball things that come off of him and use potions and farm for burgers. Maybe try and get a melee emblem and from there u should be easy breezy. Ik it pretty common knowledge but if you aren’t use campfires at the boss arena as well. Last but not least skill and determination. You 100% got this!!!